pregnancies can be described by a Normal model with mean 265 days and standard deviation 18 days. a) What percentage of pregnancies should last between 269 and 281 days? b) At least how many days should the longest 20% of all pregnancies last? c) Suppose a certain obstetrician is currently providing prenatal care to 58 pregnant women. Let y represent the mean length of their pregnancies. According to the Central Limit Theorem, what's the distribution of this sample mean, y? Specify the model, mean, and standard deviation. d) What's the probability that the mean duration of these patients' pregnancies will be less than 262 days? a) The percentage of pregnancies that should last between 269 and 281 days is %. (Round to two decimal places as needed.)

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